I’ve heard it said that a mother of a newborn has olfactory immunity to the smell of her baby’s shit. I think dog owners must enjoy a similar acoustic immunity. Two of my neighbors have dogs that like to howl or bark. A lot. When one gets going, that starts the other, on and on in a vicious cycle. If I go outside and holler “Cleo, shut up!” Cleo’s people will notice that and bring her inside. But Cleo’s much louder howling? That they don’t notice.